Bug 1927301 - Support using mailnews rust components in suite. r=frg

See Bug 1860654 "Support Rust for Thunderbird development".

suite/Makefile.in

@@ -23,3 +23,13 @@ libs:: $(DIST)/bin/platform.ini
 	sed -e "s/^\(SourceStamp=\).*/\1$(MOZ_REV)/" $(DIST)/bin/platform.ini \
 		> $(DIST)/bin/platform.ini~
 	mv -f $(DIST)/bin/platform.ini~ $(DIST)/bin/platform.ini
+
+
+vendored-rust-check:
+ifdef MOZ_THUNDERBIRD_RUST
+	@echo "Checking vendored Rust libs"
+	$(PYTHON3) $(commtopsrcdir)/python/rocbuild/rocbuild/rust.py verify_vendored_dependencies
+endif
+
+export:: vendored-rust-check
+

suite/moz.build

@@ -21,6 +21,14 @@ DIRS += [
     "themes/modern",
 ]
 
+if CONFIG["MOZ_THUNDERBIRD_RUST"]:
+    DEFINES["MOZ_THUNDERBIRD_RUST"] = 1
+
+if CONFIG["MOZ_OVERRIDE_GKRUST"]:
+    DIRS += [
+        "../rust",
+    ]
+
 if CONFIG['MOZ_IRC']:
     DIRS += ['chatzilla']
 

suite/moz.configure

@@ -79,6 +79,28 @@ set_defconf("SEAMONKEY_VERSION_DISPLAY", seamonkey_version.version_display)
 imply_option("MOZ_PLACES", True)
 imply_option("MOZ_SERVICES_SYNC", False)
 
+# Thunderbird Rust code is now the default
+option("--disable-thunderbird-rust", help="Enable Rust support within Thunderbird")
+
+set_config("MOZ_THUNDERBIRD_RUST", True, when="--enable-thunderbird-rust")
+set_define("MOZ_THUNDERBIRD_RUST", True, when="--enable-thunderbird-rust")
+set_config("MOZ_OVERRIDE_GKRUST", True, when="--enable-thunderbird-rust")
+
+
+@depends("--enable-thunderbird-rust")
+def moz_override_cargo_config(enable_rust):
+    rust_override = "comm/rust/.cargo/config.toml.in"
+    if enable_rust:
+        log.info(f"Using {rust_override} for Rust code.")
+        return rust_override
+
+
+set_config(
+    "MOZ_OVERRIDE_CARGO_CONFIG",
+    moz_override_cargo_config,
+    when="--enable-thunderbird-rust",
+)
+
 # Building extensions is disabled by default.
 
 # =========================================================